.page-about {
  --about-pad: clamp(28px, 5vw, 72px);
  --about-num: clamp(56px, 13vw, 168px);
  --about-radius: 0;
  background: var(--ink);
  color: var(--silver);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 22px var(--gutter) 0;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--gold-hi);
  border-bottom-color: var(--gold-hi);
}

.page-about .breadcrumb span[aria-hidden="true"] {
  margin: 0 8px;
  color: var(--mist-deep);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(30px, 5vw, 68px) 0 clamp(44px, 7vw, 88px);
  border-bottom: 2px solid var(--mist-deep);
}

.page-about .about-hero__inner {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-hero__head {
  display: grid;
  gap: 18px;
  max-width: 900px;
}

.page-about .index-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .3em;
  color: var(--gold);
  text-transform: uppercase;
  margin: 0;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 9vw, 118px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--silver);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.9;
  color: var(--mist);
}

.page-about .media-frame {
  position: relative;
  overflow: hidden;
  border: 2px solid var(--mist-deep);
  box-shadow: var(--shadow-hard);
  background: var(--ink-2);
  margin: 0;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
  height: auto;
}

.page-about .media-frame--wide {
  aspect-ratio: 16 / 9;
}

.page-about .media-frame--wide img {
  height: 100%;
}

.page-about .media-frame--square {
  aspect-ratio: 1 / 1;
}

.page-about .media-frame--square img {
  height: 100%;
}

.page-about .about-hero__media {
  filter: saturate(.92) contrast(1.04);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: clamp(52px, 8vw, 120px) 0;
  border-bottom: 2px solid var(--mist-deep);
}

.page-about .about-chapter__inner {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  gap: clamp(24px, 4vw, 56px);
}

.page-about .about-chapter__aside {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: var(--about-num);
  font-weight: 700;
  line-height: .78;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 2px var(--mist-deep);
  pointer-events: none;
}

.page-about .about-chapter__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 42px);
  line-height: 1.2;
  letter-spacing: .01em;
  color: var(--silver);
}

.page-about .about-chapter__body {
  display: grid;
  gap: 24px;
  max-width: 72ch;
}

.page-about .about-chapter__body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(233, 237, 231, .86);
}

.page-about .about-chapter__lead {
  font-size: clamp(17px, 1.7vw, 20px) !important;
  line-height: 1.8 !important;
  color: var(--silver) !important;
}

/* 深色底变体 */
.page-about .about-chapter--ink {
  background: var(--ink);
}

.page-about .about-chapter--ink2 {
  background: var(--ink-2);
}

/* 暖纸浅底变体 */
.page-about .about-chapter--paper {
  background: var(--paper);
  border-bottom-color: rgba(11, 20, 18, .5);
  color: var(--ink);
}

.page-about .about-chapter--paper .about-chapter__num {
  -webkit-text-stroke: 2px rgba(11, 20, 18, .28);
}

.page-about .about-chapter--paper .about-chapter__name {
  color: var(--ink);
}

.page-about .about-chapter--paper .about-chapter__body p,
.page-about .about-chapter--paper .about-chapter__lead {
  color: rgba(11, 20, 18, .82) !important;
}

.page-about .about-chapter--paper a {
  color: var(--indigo);
}

/* ---------- 引文块 ---------- */
.page-about .about-quote {
  margin: 4px 0;
  padding: 6px 0 6px 22px;
  border-left: 2px solid var(--gold);
  display: grid;
  gap: 8px;
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.2vw, 26px);
  line-height: 1.65;
  color: var(--gold-hi) !important;
}

/* ---------- 视觉基因 ---------- */
.page-about .about-origin__split {
  display: grid;
  gap: 26px;
}

.page-about .about-origin__figure {
  border-color: rgba(11, 20, 18, .45);
  box-shadow: 6px 6px 0 rgba(11, 20, 18, .35);
}

.page-about .about-origin__text {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-palette {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .about-palette__item {
  display: grid;
  gap: 8px;
  padding: 14px;
  border: 2px solid rgba(11, 20, 18, .35);
  background: rgba(233, 237, 231, .5);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-palette__item:hover {
  transform: translateY(-3px);
  border-color: var(--gold);
}

.page-about .about-palette__chip {
  display: block;
  height: 44px;
  border: 2px solid rgba(11, 20, 18, .55);
}

.page-about .about-palette__chip--mist { background: var(--mist); }
.page-about .about-palette__chip--gold { background: var(--gold); }
.page-about .about-palette__chip--silver { background: var(--silver); }
.page-about .about-palette__chip--indigo { background: var(--indigo); }

.page-about .about-palette__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16px;
  color: var(--ink);
}

.page-about .about-palette__use {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(11, 20, 18, .68);
}

.page-about .about-origin__note {
  margin: 0;
  padding-top: 18px;
  border-top: 2px dashed rgba(11, 20, 18, .3);
  font-size: 15px;
  line-height: 1.9;
  color: rgba(11, 20, 18, .74) !important;
}

/* ---------- 时间轴 ---------- */
.page-about .about-steps {
  display: grid;
  gap: 16px;
  margin-top: 4px;
}

.page-about .about-step {
  border: 2px solid var(--mist-deep);
  background: var(--ink-2);
  box-shadow: var(--shadow-hard);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-step:hover {
  border-color: var(--gold);
}

.page-about .about-step[open] {
  border-color: var(--gold);
  box-shadow: var(--shadow-gold);
}

.page-about .about-step__head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 6px 16px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-step__head::-webkit-details-marker {
  display: none;
}

.page-about .about-step__head::after {
  content: "+";
  grid-column: 1 / -1;
  justify-self: end;
  margin-top: -34px;
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--gold);
  transition: transform var(--dur) var(--ease);
}

.page-about .about-step[open] .about-step__head::after {
  content: "–";
}

.page-about .about-step__index {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(18px, 2.2vw, 24px);
  color: var(--silver);
  letter-spacing: .01em;
}

.page-about .about-step__hint {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mist);
}

.page-about .about-step__body {
  padding: 0 20px 20px;
  border-top: 1px dashed rgba(143, 184, 174, .35);
  margin-top: 0;
}

.page-about .about-step__body p {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(233, 237, 231, .84);
  max-width: 68ch;
}

.page-about .about-timeline__more {
  margin: 0;
  font-size: 15px;
  color: var(--mist) !important;
}

.page-about .about-timeline__more a {
  color: var(--gold-hi);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  padding-bottom: 2px;
}

.page-about .about-timeline__more a:hover {
  color: var(--silver);
  border-bottom-color: var(--silver);
}

/* ---------- 团队 ---------- */
.page-about .about-team__split {
  display: grid;
  gap: 26px;
}

.page-about .about-team__text {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-team__figure {
  border-color: var(--mist-deep);
}

.page-about .about-team__figure img {
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-figures {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .about-figures__item {
  display: grid;
  gap: 4px;
  padding: 16px 16px 18px;
  border: 2px solid var(--mist-deep);
  background: rgba(11, 20, 18, .55);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-figures__item:hover {
  border-color: var(--gold);
  transform: translateY(-3px);
}

.page-about .about-figures__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-figures__label {
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 指标 ---------- */
.page-about .about-metrics {
  display: grid;
  gap: 18px;
}

.page-about .about-metric {
  padding: 22px 20px 24px;
  border: 2px solid rgba(11, 20, 18, .45);
  background: rgba(233, 237, 231, .58);
  box-shadow: 6px 6px 0 rgba(11, 20, 18, .22);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-metric:hover {
  transform: translateY(-3px);
  border-color: var(--gold);
}

.page-about .about-metric__value {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(34px, 5vw, 54px);
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-metric__unit {
  font-size: 14px;
  font-weight: 400;
  letter-spacing: .06em;
  color: rgba(11, 20, 18, .62);
}

.page-about .about-metric__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  color: var(--ink);
}

.page-about .about-metric__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(11, 20, 18, .74) !important;
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-reach__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
  padding-top: 20px;
  border-top: 2px dashed rgba(143, 184, 174, .32);
}

.page-about .about-reach__links a {
  font-size: 15px;
  color: var(--gold-hi);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 162, 75, .5);
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-reach__links a:hover {
  color: var(--silver);
  border-bottom-color: var(--silver);
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  padding: clamp(56px, 10vw, 130px) 0 clamp(64px, 11vw, 150px);
  background:
    radial-gradient(120% 100% at 15% 0%, rgba(78, 124, 116, .28) 0%, transparent 62%),
    var(--ink);
  border-bottom: 2px solid var(--mist-deep);
}

.page-about .about-close__inner {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  gap: 18px;
}

.page-about .about-close__big {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 82px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--silver);
}

.page-about .about-close__small {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .24em;
  color: var(--gold);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-palette {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-chapter__inner {
    grid-template-columns: minmax(0, 250px) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 80px);
  }

  .page-about .about-chapter__aside {
    position: sticky;
    top: 40px;
    align-self: start;
  }

  .page-about .about-origin__split {
    grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-team__split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (min-width: 1200px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-step__head {
    grid-template-columns: minmax(0, 220px) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .about-step__head::after {
    grid-column: 2 / 3;
    justify-self: end;
    margin-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-palette__item,
  .page-about .about-figures__item,
  .page-about .about-metric {
    transition: none;
  }

  .page-about .about-palette__item:hover,
  .page-about .about-figures__item:hover,
  .page-about .about-metric:hover {
    transform: none;
  }
}